Datasheet

(V
DD
= +2.7V to +3.6V (MAX11627/MAX11629/MAX11633); V
DD
= +4.75V to +5.25V (MAX11626/MAX11628/MAX11632), f
SAMPLE
= 300kHz, f
SCLK
= 4.8MHz external clock (50% duty cycle), V
REF
= 2.5V (MAX11627//MAX11629/MAX11633); V
REF
= 4.096V
(MAX11626/MAX11628/MAX11632), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CONVERSION RATE
Power-Up Time t
PU
External reference 0.8
µs
Internal reference (Note 3) 65
Acquisition Time t
ACQ
0.6 µs
Conversion Time t
CONV
Internally clocked 3.5
µs
Externally clocked (Note 4) 2.7
External Clock Frequency f
SCLK
Externally clocked conversion 0.1 4.8
MHz
Data I/O 10
Aperture Delay 30 ns
Aperture Jitter < 50 ps
ANALOG INPUT
Input Voltage Range Unipolar 0 V
REF
V
Input Leakage Current V
IN
= V
DD
±0.01 ±1 µA
Input Capacitance During acquisition time (Note 5) 24 pF
INTERNAL REFERENCE
REF Output Voltage
MAX11626/MAX11628/MAX11632 4.024 4.096 4.168
V
MAX11627/MAX11629/MAX11633 2.48 2.50 2.52
REF Temperature Coefcient TC
REF
MAX11626/MAX11628/MAX11632 ±20
ppm/°C
MAX11627/MAX11629/MAX11633 ±30
Output Resistance 6.5 kΩ
REF Output Noise 200 µV
RMS
REF Power-Supply Rejection PSRR -70 dB
EXTERNAL REFERENCE INPUT
REF Input Voltage Range V
REF
1.0 V
DD
+ 50mV V
REF Input Current I
REF
V
REF
= 2.5V (MAX11627/MAX11629/
MAX11633); V
REF
= 4.096V
(MAX11626/MAX11628/MAX11632),
f
SAMPLE
= 300ksps
40 100
µA
V
REF
= 2.5V (MAX11627/MAX11629/
MAX11633); V
REF
= 4.096V
(MAX11626/MAX11628/MAX11632),
f
SAMPLE
= 0
±0.1 ±5
MAX11626–MAX11629/
MAX11632/MAX11633
12-Bit, 300ksps ADCs
with FIFO and Internal Reference
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Electrical Characteristics (continued)